Harmful algal blooms (HABs) consist of aggregations of algae that range in size from microscopic single-celled organisms (microalgae) to large seaweeds (macroalgae). HABs can have lethal and sub-lethal effects on aquatic life, including deoxygenation(caused by the depletion of oxygen via the bacterial decomposition of algae), ichthyotoxicity (from phycotoxins produced), or physical interference (clogging or damaging of gills), emphasizing the importance of HAB monitoring at or near these sites. TheHABs that gamer the greatest concern are those that can produce high levels of toxins and those that create enough biomass to deplete oxygen levels and lead to the suffocation and death of aquatic life.
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